For someone who presented with depression, later found to be bipolar 2... is ativan a good choice?

I haven't started my Lamictal because I'm still breastfeeding. However, today was the first day that I needed to take an ativan. I was needing to move, had to move, could NOT sit still, not for one second, or it drove me crazy.

Yet, here I stand now, content with out moving my feet, and I can even stop typing and I don't have the urge to move.

However I've read that it's a depressant? That can't be a good idea!!!